/Engine/Plugins/FX/Niagara/Source/Niagara/Classes/NiagaraSystem.h
Duplicates an existing emitter handle and adds it to the System. The new handle will reference the same source asset, but will have a copy of the duplicated Instance value.
[FNiagaraEmitterHandle](API\Plugins\Niagara\FNiagaraEmitterHandle) DuplicateEmitterHandle ( const [FNiagaraEmitterHandle](API\Plugins\Niagara\FNiagaraEmitterHandle) & EmitterHandleToDuplicate, [FName](API\Runtime\Core\UObject\FName) EmitterName )